US7349747B2 - Monitoring device and monitoring method for injection molding machine - Google Patents

Monitoring device and monitoring method for injection molding machine Download PDF

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Publication number
US7349747B2
US7349747B2 US11/177,414 US17741405A US7349747B2 US 7349747 B2 US7349747 B2 US 7349747B2 US 17741405 A US17741405 A US 17741405A US 7349747 B2 US7349747 B2 US 7349747B2
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items
molding
monitoring
values
displayed
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US20060009874A1 (en
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Osamu Saito
Kenji Araki
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Fanuc Corp
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Fanuc Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/76—Measuring, controlling or regulating
    • B29C2045/7606—Controlling or regulating the display unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7604—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76066—Time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76083—Position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/761—Dimensions, e.g. thickness
    • B29C2945/76107—Dimensions, e.g. thickness volume
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7611—Velocity
    • B29C2945/7612—Velocity rotational movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/7618—Injection unit
    • B29C2945/76187—Injection unit screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/7618—Injection unit
    • B29C2945/7619—Injection unit barrel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76367—Metering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76381—Injection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76344—Phase or stage of measurement
    • B29C2945/76434—Parameter setting

Definitions

  • the present invention relates to a device for monitoring various variables indicative of molding states of an injection molding machine and a monitoring method.
  • values for various monitoring items for each molding cycle are measured, including molding cycle time, injection time, kneading time, cushion amount, nozzle and barrel temperatures, peak pressure, etc.
  • the measured values are displayed and used for the molding state monitoring and product quality discrimination.
  • values of measured data such as filling time, plasticization time, injection start time, injection end time, etc.
  • values of measured data are displayed in the time series for each molding cycle. If set values of various molding conditions change as this is done, the changed items and the set values before and after the change are displayed.
  • quality data such as die temperature, filling time, cushion amount, etc.
  • quality data such as die temperature, filling time, cushion amount, etc.
  • a data trend graph a line graph along a time base, or change of molding condition items is discriminately displayed in a colored bar graph.
  • measured values and set values reference, upper limit, and lower limit values
  • set pressure-holding values and their detected values, as well as set speed values and their detected measured values are displayed for each molding cycle.
  • the measured values of the monitoring items indicative of the molding states for each molding cycle are generally obtained and displayed in order to monitor the molding states or discriminate molding failure. Since the measured values of the monitoring items indicative of the molding states vary depending on change of the set values of the correlated molding conditions, moreover, the change of the set values of the molding conditions and the measured values of the monitoring items are displayed together, as described in JP7-4844B2, JP2001-293761A and JP2003-1686A. In the method described in JP7-4844B2, however, monitoring data on the measured values of each shot or molding cycle are displayed in a graphic form, and the set values before and after the change are displayed. Although the time when the set values are changed can be detected with ease, it is hard to grasp the influence of the change on the measured values of the monitoring items.
  • the measured values of some monitoring items are displayed as the trend graph along the time base, and sections in which the molding conditions are changed are also displayed.
  • the molding condition items with their set values changed and the changed set values are not displayed on the same screen as the trend graph. Thus, it is hard to grasp the influence of the change of the molding conditions on the measured values of the monitoring items.
  • the molding states change depending on the change of the set values of the molding conditions
  • the apparent measured values of the monitoring items indicative of the molding states change when the molding conditions are changed.
  • the molding conditions are diverse and large in number.
  • measured values such as die and barrel temperatures can be supposed to correspond one-to-one to the set values.
  • the measured values of the monitoring items never correspond one-to-one to the set values of the molding conditions, and some measured values of the monitoring items change in complicated relation to a plurality of set values.
  • a generally-called peak pressure or the maximum pressure value that is measured in an injection pressure hold process is an important item in molding quality control.
  • the peak pressure changes as the set values of the injection speed, resin melting temperature, injection pressure hold switching position, etc. are changed.
  • the metering time is influenced by a set value of the barrel temperature that melts a resin, as well by set values of the rotational frequency and metering back pressure that are directly related to the action of a metering axis during metering operation.
  • the minimum cushion amount corresponds to the most advanced position of a screw in the injection pressure hold process. It is influenced by set values of very many molding conditions, such as the injection speed, hold pressure, pressure hold time, resin melting temperature, etc., as well as by a metering end position and a switching position for the injection pressure hold process.
  • the various monitoring items indicative of the molding states are influenced by the set values of a plurality of molding condition items.
  • the molding condition items that influence the measured values of the monitoring items may vary depending on the set values.
  • the present invention provides a monitoring device for an injection molding machine in which changes of set values of molding conditions and changes of measured values of monitoring items are displayed as a trend chart on a common axis so that they can be grasped correspondingly.
  • a monitoring device of the present invention comprises: measuring means for measuring values of monitoring items indicative of molding states in each molding cycle; storing means for storing the values measured by the measuring means; set-value change history storing means for storing a history of change of set values of molding condition items; display-item designating means for designating one or more monitoring items and one or more molding condition items; and display means for displaying the measured values of the designated monitoring items and the history of change of the set values of the designated molding condition items in a form of a trend chart on a common axis.
  • the monitoring device may further comprise display-range designating means for designating a display range of the trend chart, and the display-item designating means may designate molding condition items to be displayed on the trend chart among one or more molding condition items set values of which have been changed in the display range designated by the display-range designating means.
  • the display-item designating means may designate molding condition items to be displayed on the trend chart among one or more molding condition items set values of which are correlated with the measured values of the designated monitoring items.
  • the monitoring device may be constituted by the injection molding machine and a managing device.
  • a monitoring method of the present invention comprise: storing measured values of monitoring items indicative of molding states in each molding cycle and a history of change of set values of molding condition items; designating one or more monitoring items and one or more molding condition items indirectly influential in the measured values of the designated monitoring items; and displaying the measured values of the designated monitoring items and set values of the molding condition items indirectly influential in the measured values in a form of a trend chart on a common axis.
  • the monitoring method may further comprise designating a display range, and molding condition items to be displayed on the trend chart may be designated among one or more molding condition items set values of which have been changed within the display range. Further, the molding condition items to be displayed on the trend chart may be designated among one or more molding condition items set values of which are correlated with the measured values of the designated monitoring items.
  • the influence of the set values of the molding condition items on the measured values of the monitoring items can be grasped with ease. Further, the molding condition items with the set values changed within the display range can be selectively displayed. Since the set values of the molding condition items correlated with the measured values of the monitoring items selected for display can be selectively displayed, moreover, the influence of the set value change for the molding conditions on the measured values of the monitoring items can be grasped efficiently.
  • FIG. 1 is a schematic block diagram showing a first embodiment of the present invention
  • FIG. 2 is a diagram illustrating measured value storing means according to the first embodiment
  • FIG. 3 is a diagram illustrating an example of set value change history storing means according to the first embodiment
  • FIG. 4 is a diagram illustrating another example of the set value change history storing means according to the first embodiment
  • FIG. 5 is a flowchart showing trend chart display processing according to the first embodiment
  • FIG. 6 is a continuation of the flowchart showing the trend chart display processing
  • FIG. 7 shows an example of a measured value selection screen according to the first embodiment
  • FIG. 8 shows an example of a set value selection screen according to the first embodiment
  • FIG. 9 shows an example of a trend chart display screen according to the first embodiment
  • FIG. 10 is a diagram for illustrating a method for obtaining a correlation coefficient according to the first embodiment
  • FIG. 11 is a diagram showing a coefficient of correlation between set values and measured values according to the first embodiment.
  • FIG. 12 is a schematic block diagram showing a second embodiment of the invention.
  • FIG. 1 is a schematic block diagram showing a first embodiment of the present invention.
  • An injection molding machine 1 is provided with various measuring means 1 a for detecting molding conditions, such as a temperature sensor, pressure sensor, speed sensor, position sensor, etc.
  • the temperature sensor detects temperatures of dies and barrels, while the pressure sensor detects a resin pressure.
  • the speed sensor detects the rotational speed of an injection screw and an injection speed or the axial movement speed of the injection speed.
  • the position sensor detects the moved position of the injection screw.
  • the injection molding machine 1 is controlled by a controller 2 , and measured values obtained by measuring means 1 a are collected by the controller 2 and utilized for the control of the injection molding machine 1 .
  • a managing device 3 is connected to the controller 2 of the injection molding machine 1 by a communication line or the like.
  • the managing device 3 is composed of a computer, such as a personal computer, and is provided with display means 3 d , formed of a processor, memory, CRT, liquid crystal, etc., and manual input means, such as a keyboard, mouse, etc., for inputting data and commands.
  • the manual input means constitutes designating means 3 c for designating display items, display range, etc.
  • the memory is provided with measured value storing means 3 a and set-value change history storing means 3 b.
  • Various set values are inputted to the controller 2 through its own display means and manual input means. Based on the set values and a control program, the controller 2 controls the injection molding machine 1 . Further, the controller 2 collects the various measured values from the measuring means 1 a that is attached to the injection molding machine 1 . Some of the measured values are utilized to control the injection molding machine 1 . Based on the measured values measured by the measuring means 1 a , moreover, the controller 2 obtains measured values of various monitoring items.
  • the managing device 3 acquires measured values of the monitoring items collected and obtained by the controller 2 , and stores them into the measured value storing means 3 a.
  • FIG. 2 is a diagram illustrating the measured value storing means 3 a that stores the measured values.
  • a data number represents the number of sampled memories of monitor data (measured values of monitoring items). If the monitor data are obtained with every molding cycle, a measured value can be obtained for each monitoring item with every molding cycle.
  • the managing device 3 may acquire the measured values of the aforesaid monitoring items from the controller 2 and store them into the measured value storing means 3 a with every molding cycle.
  • the measured values may be sampled with every plurality of cycles or every fixed time, and the number of data may be reduced by thinning.
  • the measured value storing means 3 a is stored with a history of the measured values of the monitoring items.
  • FIG. 3 is a diagram illustrating an example of the set-value change history storing means 3 b .
  • an i'th data number is stored with a set value change time Tc(i), then value Sc(i) in the shot counter, changed molding condition item I 1 ( i ), unchanged set value B(i), changed set value A(i) in a set every time the set values of the molding conditions are changed.
  • FIG. 4 is a diagram illustrating another example of the set-value change history storing means 3 b.
  • the managing device is stored with the then time Tc(i), shot counter value Sc(i), and set values S 1 ( i ) to SM(i) for molding conditions 1 to M.
  • the changed set values of the molding conditions may be stored so that molding condition items ID and changed and unchanged set values corresponding to measured value data, as shown in FIG. 3 . Since one or more set value changes sometimes correspond to one measured value, the individual changes are stored.
  • the set value of each then molding condition may be stored corresponding to the measured value data stored in the measured value storing means 3 a shown in FIG. 2 .
  • the managing device 3 stores the measured values (monitor data) for the monitoring items from the controller 2 of the injection molding machine in the time series, and also stores a set value change history for the molding conditions. If an operator then inputs a trend chart display command with the manual input means of the managing device 3 , the processor of the managing device 3 carries out the processing shown in FIGS. 5 and 6 and displays a trend chart.
  • the processor displays a measured value selection screen on the display means 3 d (Step 100 ).
  • FIG. 7 shows an example of the measured value selection screen displayed on the display means 3 d .
  • a list of the monitoring items is displayed in a column P 1 for “Plot Items” so that all the monitoring items can be displayed by scrolling.
  • a monitoring item to be displayed as the trend chart is selected among the displayed monitoring items.
  • a column P 2 for “Range Setting” is a column in which a variable axis (abscissa axis) for the trend chart display is designated, and “Record”, “Period”, and “Time” are selectable. If “Record” is selected, a variable on the abscissa axis of the trend chart is a shot number (molding cycle number). If “Period” or “Time” is selected, the variable on the abscissa axis of the trend chart is time.
  • a column P 3 for “Range (Record)” can be set, a starting shot number for a section in which the trend chart is displayed can be entered in a column “Starting Position”, and a shot number of to be displayed can be entered in a column “Data Number”.
  • a column P 4 for “Range (Time)” can be set. If “Time” is set, “Start Time” and “End Time” of the trend chart can be set. If “Period” is set, “Start Time” and a period duration can be set. In the example shown in FIG. 7 , “Time” is selected as the variable axis, and the start and end times are set.
  • the measured value selection screen shown in FIG. 7 is displayed on the display means 3 d in Step 100 .
  • the processor repeatedly determines whether or not monitoring items displayed in plotted items are selected (Step 101 ), whether or not the axis of the trend chart is selected (Step 103 ), whether or not the display range is selected (Step 105 ), whether or not the “Cancel” button is depressed (Step 107 ), and whether or not the “OK” button is depressed (Step 108 ).
  • Step 101 When the operator selects the monitoring items by using the mouse or the like (Step 101 ), the selection of the selected monitoring items is displayed and stored (Step 102 ). In the example shown in FIG. 7 , “Metering Time”, “Minimum Cushion Amount”, and “Peak Time” are selected.
  • Step 103 If the axis of the trend chart is selected (Step 103 ), moreover, it is stored. If the selected axis of the trend chart is “Record”, the column P 3 for “Range (Record)” is made settable. If the selected axis is “Period” or “Time”, on the other hand, the column P 4 for “Range (Time)” is made settable (Step 104 ).
  • Step 106 If set values are entered in the column P 3 or P 4 for the range (Step 105 ), the entered values are stored (Step 106 ).
  • Step 107 If the “Cancel” button is depressed (Step 107 ), moreover, all of the selected items, axis of trend chart and set display range are cancelled (Step 110 ), and the procedure returns to Step 101 , in which selective setting is performed again.
  • Step 108 If the “OK” button is depressed (Step 108 ), the selected items, trend chart axis, and range are settled and registered (Step 109 ). Then, the screen of the display means 3 d is switched over to a set value selection screen and displayed (Step 111 ).
  • FIG. 8 shows a display example of this set value selection screen. Molding condition items are displayed in a column P 6 for “Plot Items”. When a method for retrieving set values, which will be mentioned later, is not set, all the molding condition items are displayed so that they can be selected.
  • a column P 7 is intended for the specification of the set value retrieval method. If “Search Set Values Changed in Display Range” is selected, those set values which are changed within the display range stored in Step 109 are searched, and the display in the column P 6 for “Plot Items” is switched so that molding conditions with changed set values are displayed. If “Search Set Values Correlated with Selected Items” is selected, those molding condition items which are correlated with the measured values of the monitoring items registered and stored in Step 109 are displayed in the column P 6 for “Plot Items”.
  • the molding condition items correlated with the measured values of the monitoring items may be registered in advance.
  • Step 111 in this case, only the registered molding condition items corresponding to the monitoring items stored and registered in Step 109 are displayed. Alternatively, moreover, all the molding condition items may be displayed. In this case, the registered molding condition items are displayed with different colors or specific icons.
  • all the molding condition items may be displayed in the column P 6 for “Plot Items”. If “Search Set Values Changed in Display Range” or/and “Search Set Values Correlated with Selected Items” are selected and set, in this case, the molding condition items concerned are displayed with different display colors or icons. If all the molding condition items are displayed in black and if “Search Set Values Changed in Display Range” is selected, for example, molding condition items with set values changed within the display range are turned to yellow, for example. If “Search Set Values Correlated with Selected Items” is selected, the correlated molding condition items (with correlation coefficients not lower than a predetermined value) are turned to green, for example.
  • the molding condition items that agree with both these requirements are turned to red as they are displayed.
  • the molding condition items are displayed in black, yellow, green, and red in the column P 6 for “Plot Items”, depending on the aforesaid retrieval method.
  • the aforesaid set value selection screen is displayed on the display means 3 d in Step 111 .
  • the processor repeatedly determines whether or not “Search Set Values Changed in Display Range” in the column P 7 is selected (Step 112 ), whether or not “Search Set Values Correlated with Selected Monitoring Items” is selected (Step 117 ), whether or not the molding condition items are selected (Step 122 ), whether or not the “Cancel” button is depressed (Step 124 ), and whether or not the “OK” button is depressed.
  • Step 112 it is determined whether or not there is any molding condition items set values of which has been changed within the display range registered and stored in Step 109 by searching the set-value change history storing means 3 b (Step 113 ). Then, it is determined whether or not the correlated molding condition items have been already selected (Step 114 ). If they are not selected, the molding condition items set values of which have been changed obtained by the retrieval are displayed in the column P 6 for “Plot Items” (or the previously displayed molding condition items are displayed in different colors) (Step 116 ).
  • Step 115 the molding condition items the set values of which changed within the display range obtained in Step 113 are displayed in the order of higher correlation (or the items are displayed in different colors) (Step 115 ).
  • Step 117 If “Search Set Values Correlated with Selected Items” is selected (Step 117 ), on the other hand, the coefficient of correlation between the measured values of the registered and stored monitoring items and the set values of the molding condition items is obtained within the display range registered and stored in Step 109 (Step 118 ). A method for obtaining this correlation coefficient will be described later.
  • Step 119 It is determined whether or not “Search Set Values Changed in Display Range” is already selected and if the molding condition items to be displayed are selected. If “Search Set Values Changed in Display Range” is not selected and if the molding condition items to be displayed are not selected, the molding condition items are displayed in the column P 6 for “Plot Items” in the order of higher correlation coefficient (Step 120 ). As mentioned before, in this case, the items may be displayed in different colors.
  • Step 122 If the molding condition items displayed in the column P 6 for “Plot Items” is then selected (Step 122 ), the selected items are stored (Step 123 ). Unless the “Cancel” or “OK” button is depressed (Step 124 or 125 ), the processes of Steps 112 to 126 are executed, and the molding condition items are selected. If the “Cancel” button is depressed, all the previously selected items are cancelled, whereupon the procedure returns to Step 112 . If the “OK” button is depressed (Step 125 ), on the other hand, a set trend axis (time or shot number) registered and stored in Step 109 is set as an abscissa axis.
  • the measured values of the selected monitoring items registered and stored in Step 109 and a history of the set values of the selected molding condition items stored in Step 123 are read out from the measured value storing means 3 a and the set-value change history storing means 3 b , and displayed as a trend chart, as shown in FIG. 9 .
  • “Metering Time”, “Minimum Cushion Amount”, and “Peak Time” are selected as the monitoring items, and “Barrel 3 Temperature” and “1st Stage Injection Speed” are selected as the molding condition items, and a trend chart is displayed such that the measured values and set values of these items are graphed with time on its abscissa axis. Further, the set values of “Barrel 3 Temperature” and “1st Stage Injection Speed” as the molding condition items are changed into 12/24 09:59:43 (see column P 14 ).
  • the value of the abscissa axis (time base) and the shot counter value (record) are displayed in a column P 10 . Further, statistical data are displayed in a column P 11 , and measured values of axial positions (times) selected with the mouse, keyboard, etc. are numerically displayed in a column P 12 . Displayed in a column P 13 , moreover, are a set value change history for the molding conditions for the positions selected with the mouse, keyboard, etc. and set values before and after the change. In this example, a point of time when the set values of the molding condition items (when “Barrel 3 Temperature” and “1st Stage Injection Speed” on the trend chart are changed) are selected, so that the set values before and after the change are displayed.
  • FIG. 10 is a diagram for illustrating the method for obtaining the correlation coefficient in Step 118 .
  • monitoring items D 1 and D 2 are selected, measured values of the monitoring items D 1 and D 2 , compared with times T( 1 ), T( 2 ), T( 3 ), . . . T(N) for a selected display range, are D 1 ( 1 ), D 1 ( 2 ), D 1 ( 3 ), . . . D 1 (N) and D 2 ( 1 ), D 2 ( 2 ), D 2 ( 3 ), . . . D 2 (N), respectively, and corresponding set values of molding condition items S 1 to SM are S 1 ( 1 ), S 1 ( 2 ), S 1 ( 3 ), . . .
  • the coefficient of correlation between the set values S 1 for the molding conditions and the measured values D 1 can be obtained by calculation with use of the data S 1 ( 1 ), S 1 ( 2 ), S 1 ( 3 ), . . . S 1 (N) and the data D 1 ( 1 ), D 1 ( 2 ), D 1 ( 3 ), . . . D 1 (N) as variables, and the obtained correlation coefficient is given by R 1 ( 1 ).
  • a correlation coefficient R 2 ( 1 ) between the set values S 1 for the molding conditions and the measured values D 2 can be obtained by calculation with use of the data S 1 ( 1 ), S 1 ( 2 ), S 1 ( 3 ), . . .
  • a correlation coefficient R 1 ( 2 ) between the set values S 2 for the molding conditions and the measured values D 1 can be obtained by calculation with use of the data S 2 ( 1 ), S 2 ( 2 ), S 2 ( 3 ), . . . S 2 (N) and the data D 1 ( 1 ), D 1 ( 2 ), D 1 ( 3 ), . . . D 1 (N) as variables. Thereafter, correlation coefficients R 1 ( 1 ) to R 1 (M) and R 2 ( 1 ) to R 2 M are obtained in like manner, as shown in FIG. 11 .
  • the molding condition items are displayed in the column P 6 for “Plot Items” of FIG. 8 in the order of priority of the correlation coefficients thus obtained. Further, only the molding condition items with correlation coefficients not lower than a predetermined value are displayed. Since some displayed set values, such as temperatures, are influenced with delay by the change, the time for the acquisition of the correlation coefficients may be shifted.
  • the managing device 3 is provided in the first embodiment of the present invention shown in FIG. 1 . Since the controller of the injection molding machine is provided with storing means, a display unit, and manual input means, however, these elements may be used to constitute the measured value storing means 3 a , set-value change history storing means 3 b , designating means 3 c , and display means 3 d . Thus, the controller of the injection molding machine may be provided with all these means without including any managing device. Even in the case where the managing device 3 is provided, moreover, both the controller and the managing device of the injection molding machine may be provided with measured value storing means and set value change history storing means as backup means. In this case, the designating means 3 c and the display means 3 d may be composed of display units and manual input means, such as keyboards, attached to the controller and the managing device of the injection molding machine.
  • a plurality of controllers may be connected to the managing device 3 .
  • the designating means 3 c that is attached to the managing device 3 is provided with means for designating a controller to be displayed so that the controller to be displayed can be switched.
  • the managing device 3 may be connected with one or more display units (client terminals) that have the same functions as the designating means 3 c and the display means 3 d.
  • FIG. 12 is a block diagram showing a second embodiment of the present invention.
  • a plurality of injection molding machines are connected to a managing device through a communication network or the like.
  • a managing device 3 and controllers 21 and 22 of the injection molding machines are connected by a communication network 4
  • injection molding machine bodies 11 and 12 are connected to the controllers 21 and 22 , respectively.
  • the injection molding machine bodies 11 and 12 are provided, respectively, with measuring means 11 a and 12 a , which are composed of various sensors for detecting the molding states.
  • Display units and keyboards or other manual input means of the controllers 21 and 22 constitute display means 21 d and 22 d for displaying screens shown in FIGS. 7 and 9 and designating means 21 c and 22 c for designating display items or the like.
  • the managing device 3 is provided with measured value storing means 3 a and set-value change history storing means 3 b , which can be stored with measured values of monitoring items and a set value change history for molding conditions of each injection molding machine, respectively.
  • processors of the controllers 21 and 22 When trend chart commands are inputted through the manual input means of the controllers 21 and 22 of each injection molding machine, processors of the controllers 21 and 22 perform the same processing as the one shown in FIGS. 5 and 6 , thereby displaying a trend chart.
  • the second embodiment differs from the first embodiment only in that data on each corresponding injection molding machine are read through the communication network 4 from data stored in the measured value storing means 3 a and the set-value change history storing means 3 b of the managing device 3 when molding condition items with changed set values are searched in Step 113 and when the coefficient of correlation between measured values and molding condition set values in Step 118 .
  • the processing shown in FIGS. 5 and 6 is executed by the processors, designating means 21 c and 22 c , and display means 21 d and 22 d of the controllers 21 and 22 .
  • data on the different controllers 21 and 22 may be displayed by the designating means 21 c and 22 c that are attached to the controllers.
  • the managing device 3 may be connected with one or more display units (client terminals) that have the same functions as the designating means 21 c and 22 c and the display means 21 d and 22 d.
  • the measured value storing means 3 a and the set-value change history storing means 3 b may be arranged in the controllers 21 and 22 , respectively, not in the managing device 3 .
US11/177,414 2004-07-09 2005-07-11 Monitoring device and monitoring method for injection molding machine Expired - Fee Related US7349747B2 (en)

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US9993868B2 (en) 2012-01-16 2018-06-12 Oskar Frech Gmbh + Co. Kg Control device for the advancing motion of a casting plunger
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EP1614522B1 (en) 2007-10-17
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CN1718416A (zh) 2006-01-11
US20060009874A1 (en) 2006-01-12

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